Another thing to consider is quarentee. It is often recommended to keep any new addition to your collection separate from your existing collection for at least 3 months. This way you can test for any communicable parasites or diseases in the newcomer before introducing her to your collection. Three clean fecals several weeks a part (a month is best) is also good to get.
A female bearded dragon should be at least 15 months old before being bred, to ensure she is fully mature and at the ideal weight (350g or more I beleive). Also, though breeding dragons may sound likea fun prospect, there is alot of things to consider before breeding your dragons. Cost of raising the babies is just the least thing to consider.